Page 58 - PVT Property Correlations

38 PVT Property Correlations

TABLE 3.3 Gas Formation Volume Factor
Gas Formation Volume Factor General Equation

TABLE 3.4 Gas Compressibility
Gas Compressibility General Equation McCain (1990)

TABLE 3.5 Gas Density
Gas Density General Equation

TABLE 3.6 Gas Viscosity
Gas Viscosity Al-Nasser and Al- Bicker and Katz Carr et al.
Marhoun (2012) (1943) (1954)
De Ghetto et al. Dean and Stiel (1965) Dempecy (1965) ElSharkawy
(1995) (2006)
Lee et al. (1966) Londono et al. (2002) Londono et al. Lucas (1981)
(2005)
McCain (1990) Standing (1947) Sutton (2007)

available, correlations are used to calculate the PVT properties for gases. A
review of laboratory experiments for gases is given in other texts (Ahmed,
2007; Whitson and Brule, 2000).
The inputs to dry gas correlations are rather straightforward. One needs
to know either the specific gravity of the gas or the gas composition to be
able to calculate all PVT properties for dry gas at any pressure and
temperature.
Several correlations were developed over the years to estimate dry gas
PVT properties. The calculation of the gas deviation factor is therefore one
of the first steps in preparing PVT properties of dry gases. Tables 3.3 3.9
summarize the majority of the known correlations for gas PVT properties.

Estimation of Critical Properties
Critical pressure and temperature are defined as the pressure and temperature
at the critical point. For a gas mixture, the critical point is defined as the